Radiator core



Jan. 12, G HORVATH /41ADIATOR CORE Filed March 7, 1929 2 Sheets-Sheet lI N VEN TOR.

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A TTORNE Y.

Jan. 12, 1932. G. M. HORVATH I 1,840,318

RADIATOR CORE Filed Marclf'l, 1929 2 SheetSSheet 2 INVENTOR.

A TTORNE Y.

Patented Jan. 12, 1932 PATENT OFFICE GEZA M. HORVATH, OF DETROIT,MICHIGAN RADIATOR CORE Application filed March 7, 1929. Serial No.344,938.

The present invention relates to heat exchange devices and moreespecially to socalled radiators for liquid cooled internal combustionengines such as are used with automotive vehicles.

Among the objects of the invention is to provide a core for suchradiators which shall be more easily and economically constructed thanthe commonly used types of radiator L core and which at the same timeshall be more eflicient in heat exchange than the known types ofconstruction.

Another object is the simplifying of the operation'of preparing thepartsand assembling them in the proper relation.

7 Still other objects will readily occur to those skilled in the artupon reference to the following description and theaccompanying drawingsin which Fig. 1 is a fragmentary View in elevation of a radiatorconstructed in accordance with the present invention.

Fig. 2 is an elevation of a portion of the core of such a radiator.

;5 Fig. 3 is a side elevation taken as from either side oftheconstruction shown in Fig. 4.

Fig. 4 is a section on the line 44 of Fig. 3.

Fig. 5 is a perspective view of a portion of 7 one of the spacerelements.

0 Fig. 5a is a section on line 5a-5a of Fig. 5. 7

Figs. 6 to 10 inclusive are perspective views showing the steps offormation of one of the water tubes.

4 As indicated in the drawings the radiator core consists broadly of aseries of flattened vertical tubes maintained in spaced relation bymeans of spacers 21 which latter are adapted to present a very largearea of )surface to the air passing through the core between the tubes20. The spacer is preferably of the form shown in Fig. 5 and consists ofa strip of metal of good heat conduc tivity such as copper orbronzeshaped as ini dicated in' thisfigure.

By passing the strips of metal through suitable rollers or dies they areslitted and corrugated as indicated in this figure so as to presentnumerous angular projections on each 1 side of the centralplane of thesheet and it is preferred to so form these strips that there areapproximately the same number of angular projections on each side ofthis plane. These angular projections, which are indicated at 22, areall of substantially the same height so as to contact with a water tubeas will be described later; and it is preferred also to bend the metalleft in the median plane alternately up and down as indicated at 22a sothat the passing air will be deflected laterally.

The spacer elements described are produced preferably by means of such amachine as is set forth and claimed in the prior United States PatentNo. 1,940,212, issued Sept. 18, 1917, to the present applicant.

The water tubes are preferably formed as indicated in Figs. 6 to 10 andalso in Figs. 3 and 4. In the formation of the tubes the flat blank isfirst passed through suitable rollers to give it the formation shown inFig. 7 in which two parallel depressed portions 31 are separated by awide flat portion 32 and having a flat edge 33 on each side.

. The next step in the operation of forming the tubes consists inregularly corrugating the portions 31 to produce the effect indicated at31a in Fig. 8.

After the ribbon or blank has been formed as in Fig. 8, it is cut to asuitable length and bent over on itself along the line 35 so as toproduce the flattened corrugated tube with the edges 33 coming together.

Before the bending operation which is described, is carried out, it ispreferred to flatten the blank at each end and bend outward at rightangles a portion thereof to form a flange have been hooked together asindicated the.

mating hooking elements will be flattened to fix them permanentlytogether in a tightly locked seam. This operation provides a series ofthe flattened tubes of whatever number may be found desirable, alllocked together to form a unit.

the angular projections on the spacing elements will each lie in adepression of the corrugatedwallofawater tube. 7 7

Before forming the parts as described above, is it preferred to tin themetalso that all of the parts will be provided .witha coat: ing of thetinning material which will'preferably be a soldering material, so that.after.-

assembling the several parts as just mentioned the whole assembly is,theniheatedgto such temperature as will melt the tinning or solderingcoating thereon I and when the -'assembly isallow-ed to cool all theparts will be united into one whole.

'By this operation the spacer element becomes united to th'e water tubeswith-ametallicunion and permits thereby the ready conduct of heat fromthe walls of the tube to the spacer element and consequently a moreready passageof heatfrom the water-to the passing air.

In carrying out the heating opera-"ion the simplestmethod and thepreferred method is to dip the assembly into a bath of oil, preferablypalm oil or tallow, heated to a sufficient,

temperatureso that-the oil not only furnishes the heat necessary for thesoldering operation, butacts as a fluxto prevent oxidation during theheating and'also acts as a meansto prevent oxidatlon during the coolingoff ofthe assembly.

However, before allowing the assembly,-

thus prepared 'to' cool, it is preferred to dip the front andrear facesa short-distance into a bath of melted solder so as to reinforce theedges of the spacers and tubes and insure the sealing of the edges ofthe latter.

The corrugating of the walls of-rthe water tubing increases the outsidearea andalso a more intimate contact-between the water and the metal ofthe tubes is accomplished because of the agitation ofthe waterpassingtherethrough. The strength of the assembly is also increased in that-theprojecting portions of" the spacer are lined in position through theirlying Withinthecorrugations Even before soldering the assembly-thecoacting ofthese angular projections or corrugations In a radiator core,a plurality of parallel,

vertically disposed water tubes each of which includestwo substantiallyparallel and adj acent sheets having symmetrically disposed, horizontal,outward crimps or projections, each sheet having-'its -upper and loweredges bentoutwardlyto form horizontal flanges having elongated hooks ontheir free edges,

the hooks of the adjacent sheets of-adjacent tubes being interlocked toform a core, the tubes being-formed to provide-a str ight line, verticalpath therethrough, the spaces between theinterlocked sheets containing aspacer memberw having projecting portions which overlap and :underlapthe projections or crimpsof the tube-sheotsand which are securedthereto, substantially: as shown.

GEZA M. HORVA'DH;

prevents relative movement of" the parts, in, 5 handling the assembly:

It Yllll be noted that the presentconstruction provides for conductionofthe heat from the water notonly to the outer surfaceofthe water tubes asin conventional construction but'also toth'e metal ;of the spacer,thereby greatly increasing the heat dissipation surface. v

Further, forming the spacers, as def scribed and uniting them with thewatei" tubes, the latter are greatly reinforced and enabled to withstandconsiderable internal Nil

